Control apparatus



Jan. 25`, 1949. s, KELLEY I 2,459,883

CONTROL APPARATUS Filed Oct. 27, 1945 Cecil S Kelley TTORN E Y Patented Jan. 25, Y 1949 UNITED STATES PATENT OFFICEv CONTROL APPARATUS Cecil S. Kelley, Forest Hills, Pa., assigner to The Westinghouse Air Brake Company, Wilmerding, Pa., a corporation of Pennsylvania AApplication October 27, 1945, Serial No. 625,011

9 Claims.

This invention relates to control apparatus and more particularly to means controlled or adinstable in accordance with direction of movement of a reversible member.

In -reversing a reversible internal combustion engine from operation in one direction to operation in the opposite direction it is necessary to cut-off the supply of fuel to the engine in order to permit the engine .to stop from operation in the one direction, and then maintain the -fuel cut-off until -the engine is started in the opposite direction by the usual starting means at which time fuel can Ibe resupplied to the engine.

The principal object of thejpresent invention is the provision of a directional control or responsive device adapted to be adjusted automatically in accordance with direction `of rotation of a rotatable member for, in connection with controlling the fuel supply to a reversible internal combustion engine, preventing such supply, inv reversing the engine, until af-ter the engine has become stopped from operation in one direction yand immediately permitting supply of fuel to the engine upon startingtoturn in the opposite direction. I I

Other objects and advantages will be apparent from the following more detailed description of the invention.

In the accompanying drawings, Fig. 1 is a sectional view of a directional control device embodying the invention, and Figs. 2 and 3 are sectional views of said device taken on the lines 2-2 and 3-3, respectively, on Fig. 1.

Description l As shown vin the drawing, the directional control device comprises a casing member I having a piston bore 2 in which is slidably mounted a fluid pressure controlled movable abutment preferably in the form of a piston 3. One end of this bore is closed and between pitson 3 and the closed end of bore 2 vis a pressure chamber 4 which is open to a control pipe 5. At vthe opposite side of piston 3 is -a non-pressure chamber 6 which is open to atmosphere through an opening 'l provided in a cover 8 which is securedby screws 9 to the casing over the opposite end of bore 2.

Reference numeral I indicates a portion of a rotatable shaft such as the crank shaft of a reversible internal combustion engine, and it will be noted thatflthe casingV I is disposed at one side `ofsaid shaft with the bore 2- and piston 3 in radial relation to vsaid shaft and with the end of said bore closed by cover 8 adjacent to said shaft. Reference numeral I I indicates a friction shoe disposed between the shaft I and the cover S. The shoe II may comprise a head I2 and a friction element I3 secured to one side of said head. The friction element I3 is made from any suitable friction material with an outer concave surface for frictionally contacting the peripheral surface of shaft Ill. On the opposite side of head i2 is a -rib lll extending in a direction transversely of the shaft and the edge I5 of this rib is convex in form longitudinally of the shoe for engaging a complementary surface provided on the cover 8 at opposite sides of the opening 'I lthrough said cover. When the friction shoe Il is in engagement with the surface l5 on cover 8 it is adapted to be out of contact with shaft I0.

A piston rod or plunger I E in the non-pressure chamber 6 has a sernispherical end Il disposed in a socket providedcentrally in the adjacent face of piston 3. Secured to the opposite end of rod IB within opening 'I in cover 8 is a stop member I 8 for engaging opposite sides of said opening. The stop member has two spaced apart lugs I9 between which is disposed the friction shoe rib I 4, and a pin 2l] extending .through said lugs and rib connect said shoe to the piston rod i6.

Also connected to pin 20 outside of the lugs I9 are jaws 2I provided on one end of a link 22. The opposite end of link 22 is connected by a pin 23 to arms 24 projecting from a member 25 which is journaled on a shaft 26. The shaft 26 is supported at opposite ends in .two arms 2l projecting from the casing member I. l

At the side of friction shoe II opposite Vthe member 25, the cover 8 has 4two spaced apart upstanding ears 28 `between which is disposed the shoe rib I4. These ribs and the connections between .the shoe II and casing member I including the link 22 and member 25 serve to maintain said shoe in operative relation to the shaft A piston release spring 29 encircling the piston rod IIS in the non-pressure chamber 6 bears at one end against the cover 8. The opposite end of spring 29 is supported on afollower rslidably mounted on the piston rod and carried by a pin 3| extending through said rod. The spring Iii is confined between cover 8 and the spring seat 3b under pressure for moving lthe piston 3 and the friction shoe I I to the positions in which they are shown inthe drawing when chamber fi is void of flu-id under pressure. Y

The member 25 is provided for controlling a valve structure 32 which is removably secured to .the casing member i by studs andnuts 33. The valve structure 32 comprises two valvedevices 34 having a iiuted stem 33 extending through a bushing 39 which is secured in a wall 4l] separating chamber 3l from a chamber 4I. The chamber 3l in the valve device 34 is open through a passage Vi2 to a pipe d3, while chamber 3l in the valve device is open through la passage 44 to a pipe 55. Chamber il is common to the two valve stems 33, i. e., both stems extend linto said chamber which is open through a passage i5 to a pipe lll. It will be apparent that valve 3E in the valve device 3d is Varranged to open and close communication between pipes i3 and dl, While valve '36V in the valve device 35 is arranged to vopen and close communication between pipe and pipe 4l. A spring 55 in each chamber 37 acts ion the respective valve 35 to urge i-t to its closed position u against a seat on the adjacent end of the respective bushing. Y

Each of the valve devicesY 3d and 55 further comprises a plunger 45 slidacly mounted in a bore provided in a nut 5i) secured in .a wall 5l opposite wall itl of chamber lll. A breather yopening 52 through plunger 5g connects chamber 4l to a space 53 at the opposite :side of said plunger. The plunger i9 is arranged in coaxial relation with valve 35 and its depending stem 54 for contacting the end Vof stem 38 projecting from said valve. A coil spring 55d encircling stem 54 and the portion of the respective valve stem .38 extending into chamber il is supported at one end on the bushing 3S, while the opposite and said rib has a recess for receiving said pin in the position of the parts Vin which they are shown in the drawing for preventing longitudinal change vin position of the shoe ii and cams 65. With the shoe Il in a position defined by contact between stop i8 and the left-hand side oi opening l and in lcontact with cover 8,

end bears ,against the plunger .d'9 for urging said plunger in a direction away from the valve 36.

Each plunger also has an upwardly extending stem 55 extending through a sealingV ring '5l and a. bore in nut 5B to the exterior of said nut, said ring being provided to prevent leakage of fluid under pressure rpast said stem from chamber 4 i.

The coaxially aligned valve 36,. plunger' lid and the respective stems 38, 541 and 56 inthe valve device 3d are arranged parallel to and are spaced from vthe corresponding parts of the Vvalve device 35 as will be evident from the drawing, and each'V of the two plunger stems 55Y engages a follower 5B on one side adjacent one end. The opposite ends of the two followers 58 are journaled on a pin 59 extending through and carried by the two arms 27.

The member 25 is provided with two cams 60 which are spaced apart for engagement with followers 58 on the side opposite that engaged by the plunger stems 56. identical except formed reversely, each havingr a `portion El which when in contact with the respective follower 53 is adapted to open the respective valve 36. Each cam 50 also has a portion 62 which is adapted to Contact the .respective follower 58 to permit movement of the connected plunger 45 vby springr55a to such a position as to permit closing of the respective valve 35 by its spring 55. The two portions '6I and 62 on each carn 67E) are connected together by a portion 63. Y

The portion 6l of each cam is slightly concave i4 with an upwardly extending pointed pin 64' The two cams are 'l Operation Let it be assumed that the parte Tor the directionai control device are in the positionY in which Y they are shown inthe drawing in which position the valve 35 inthe valve device 3d is closed and valve 36in the valve device 35 is open. Let it further be assumed that iiuicl under pressure is Vsupplied to pipe 5 and thence to piston chamber li. When the pressure of fluid in chamber d is thus increased on piston 's-uiciently to overcome the'opposing force of spring 29, Vsaid piston will move against said spring and actuate the piston rod l 6 to move the friction shoe i l against the shaft l5, this' movement disconnecting said shoe from pin v6ft.`

If at this time the shaft i@ is turning in a counterclockwise direction it will act through the shoe to merely maintain the stop l5, link Y 22 andthe two valves 36 in the position in which they are shown in the drawing. However if the shaft Hl'is stopped and started turning in the opposite or clockwise direction, the friction shoe will move with said shaftrthe instant it starts to turn in'said opposite direction from the ponv sition in which itis shown in the drawing to a position del-ined. by contactbetween stop hl and the left-hand 'side fof the openingV l" in cover `8. The change in position of shoe H will actuate link 22, member 25 and'cams G to open the `valve 36in the valve device 34 and to permit closure of valve 36 in the valve device 35. if the .iiuidY pressure Visl then released from chamber 4,

spring 29l will returnthe piston 3to the-position in which itis shown in the drawing and will also 4move the shoel `H vback into contact with cover t, the pin 64 Vbeing disposed in recessV 55 at the right-hand end of the shoe rib le at this time to hold said shoe Vagainst movementout of its adjusted position.v

If fluid under pressure is supplied to chamber to move shoe Il Vagainst shaft Il) and said *under Vpressure from chamberJLgthe shoe Il will be moved outof -contact with saidshaft in the position in which recess 5-'5 is aligned to receive pin M, a-s will beevident vwithout further description.

It will now be evident that I V'have provided a relative Vsi-mpledevice which will positively and promptly detect and operate upon a change in direction of rotation of a shaft or the like for selectively controlling the positioning or operation of any desired device such as the two valves 36, and positive yet simple means are provided to ensure that the parts ofthe devicek will remain in `an adjusted Y.position until a change in Vposition is desired. 1

In the copending application of Roy R. Stevens, Serial No. 602,255, led June 29, 1945, relating to control apparatus for Diesel engines there is fully disclosed and broadly covered, a directional oontrol device, substantially like that in the present application, and its association with starting and fuel control devices for said engine. The present invention is limited to the novel structure of thev directional control device, above described.

While only 'one embodiment of the invention has been disclosed it is not my intention to limit its scope to that embodiment or otherwise than by the terms of the appended claims.

Having now described my invention, what I claim as new and desire to secure by Letters Patent is:

1. In combination, a motion reversible member, structure movable by engagement with said member in either 'of two directions, stop means -cooperable with said structure tolimit movement thereof in said two directions for defining twov different positions of said structure, uid pressiue means for actuating said structure into engagement with said member, means for disengaging said structure from said member, holding means cooperable with said structure in each of said positions upon disengagement from said member to holdY said structure against movement out of the respective position in either of said directions and rendered ineffective upon movement of said structure into engagement with said member, and means operable by said structure.

2. In combination, a motion reversible member, a longitudinally and transversely movable structure, means for actuating said structure longitudinally into and out of engagement with said member, means to be controlled operable by transverse movement of said structure by said reversible member in either of two directions, stop means engageable by said structure to limit said transverse movement in both directions for defining two different positions of said structure, and means for holding said structure against transverse movement when disengaged from said reversible member and rendered ineffective by longitudinal movement of said structure into engagement with said member.

3. In combination, a motion reversible member, a longitudinally and transversely movable structure, means operable by transverse movement of said structure in either of two directions to two different positions, stop means for limiting transverse movement of said structure to a zone extending between and including said positions, fluid pressure actuated means for moving said structure longitudinally into engagement with said reversible member for movement transw versely by said reversible member, means for moving said structure longitudinally out of engagement with said reversible member, and a pin cooperable with said structure when disengaged from said reversible member to hold said structure against movement out of each of said positions and being ineffective with said structure in engagement with said reversible member.

4. In combination, a motion reversible shaft, a longitudinally and transversely movable structure including friction means for engaging said shaft upon longitudinal movement of said structure, means adjustable to either one of two positions by transverse movement of said structure by said shaft upon rotation of said shaft in either one direction or in the opposite direction, stop means cooperable with said structure in said positions to define said positions and limit transverse movement of said structure to a zone eX- tending betweenv and including said positions, means for holding ysaid structure in each of said positions upon disengagement of said friction means from said shaft, and means for moving said structure longitudinally into and out of engagement with said shaft.l

5. In combination, a motion reversible member, a friction shoe movable by said member in a direction corresponding to direction of movement of said member, stop means arranged to limit movement of said shoel in both directions to thereby define two different positions of said shoe, means to be controlled operable by said shoe, means for actuating said shoe into and out of engagement with said member, a fixed pin, said shoe including means cooperating with said pin in both of said positions when said shoe is disengaged from said member to hold said shoe against movement out of the respective position and being rendered ineffective by movement of said shoe into engagement with said member.

6. In combination, a reversible rotatable'shaft, a casing having a piston bore arranged radially to said shaft, a friction shoe for engaging said shaft adapted to be supported by said casing over one end of said bore, a plunger in said bore connected to said shoe, piston means in said bore operable by iiuid under pressure to actuate said plunger longitudinally to move said shoe against said shaft, said shoe being movable by said shaft to either one of two positions corresponding to the direction of rotation of said shaft, stop means in said casing for limiting movement of said shoe by said shaft to a zone extending between and including said two positions, means in said casing for moving said shoe out of contact with said shaft and into supporting engagement with said casing, means for holding said shoe against movement out of either one of its positions upon engagement with said casing and rendered ineffective upon engagement of said shoe with said shaft, and means to be controlled adjustable by movement of said shoe by said shaft.

'7. In combination, a reversible rotatable shaft, a casing having a piston bore arranged radially to said shaft, a friction shoe for engaging said shaft adapted to be supported by said casing over one end of said bore, a plunger in said bore connected to said shoe, piston means in said bore operable by iiuid under pressure to actuate said plunger longitudinally to move said shoe against said shaft, said shoe being movable by said shaft to either one of two positions corresponding to the direction of rotation of said shaft, stop means in said casing for limiting movement of said shoe by said shaft to a zone extending between and including said two positions, means in said casing for moving said shoe out of contact with said shaft and into supporting engagement with said casing, a pin in said casing, a recess in said shoe arranged to receive said pin in one of said positions of said shoe to hold said shoe against movement out of the last named position and said shoe being free of said pin upon engagement with said shaft, and means to be controlled connected for movement with said shoe by said shaft.

8. In combination, a reversible rotatable shaft, a casing, two position valve means in said casing, two position movable cam means associated with said casing for adjusting said valve means and comprising means cooperable with said valve means in each of itspositions to oppose movement of said cam means out of the respective po- Y Y sifti'on, a .bore in said casing -vairanged radially to said shaft, longitudinally and transversely mow able plunger means ,in said bore, a friction element. connected to and Imovable with said `plunger means and operable hy longitudinal movement of said plunger means into and ont of .engagement with said sha-ft, meansgoperable bytransverse movement of said Vplunger means and friction means -in either `one direction or in the opposite direction by saidshaft upon rotation of :said shaft in either direction tormove said cam means to a position corresponding to the direction of rotation of said shaft, and means for 'actuatingY movement of `said plunger lmeans into and .out of engagement with said shaft, .means operable by transverse movement of said plunger means andfrictien means .in either :one direction or in the opposite direction by .said shaft upon rotation Y of kksaid shaft lin ,either direction tomove said cam said plunger means longitudinally to moveV said friction means into and out of `Contact with said shaft. j

9. Infcombination, a -reversiblefrotatable shaft,

a casing, two positionvalve means Vin .said cas ing, two position movable cam means :associated with said. cas-ing for yadjustingv said valve means and comprising means cooperable with said valve means in each of its positions to oppose movement .of said cam meansiou-t of the respective position, a bore in `said casing lvarrangedradially to said Shaft., longitudinally and transversely movable, plunger means in said floors, a friction element connected Yto and movable with 'said plunger means and operable by Ylongitndinal means ,to a position .corresponding to the .direction of .rotation of said shaft, Vmeans for actuating said plunger means longitudinally to move said friction .mean-s into and out of Contact with said shaft, and holding means associated with said casing and cooperative withisaid friction means Vupon disengagement fromlsaid shaft to .prevent transverse movement of -said yplunger means and rendered `ineffective .upon longitudinalmovementV of said plunger means to move said friction means into contact with said shaft. Y

CECIL s. KELLET.

REFERENCES CITED The oliowing references .of iecord lin Ythe nie of `this patent: f

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